In Safari for iPad and Mac (but not iPhone), you can quickly open a link in a background tab by dragging it up to the tab bar. A green (+) button will appear—drop the link, and it will become a new tab.
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Little features that could make a big difference in iOS and iPadOS
I have a growing list of little features that I hope Apple will add to iOS someday. Since WWDC 2021 was not that day, I’ll share them here.